[PATCH 2/4] drm: lcdif: Don't use BIT() for multi-bit register fields
Marek Vasut
marex at denx.de
Wed Sep 28 00:10:26 UTC 2022
On 9/28/22 01:38, Laurent Pinchart wrote:
> The BIT() macro is meant to represent a single bit. Don't use it for
> values of register fields that span multiple bits.
>
> Signed-off-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>
> ---
> drivers/gpu/drm/mxsfb/lcdif_regs.h | 28 ++++++++++++++--------------
> 1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/gpu/drm/mxsfb/lcdif_regs.h b/drivers/gpu/drm/mxsfb/lcdif_regs.h
> index 013f2cace2a0..bc4d020aaa7c 100644
> --- a/drivers/gpu/drm/mxsfb/lcdif_regs.h
> +++ b/drivers/gpu/drm/mxsfb/lcdif_regs.h
> @@ -138,9 +138,9 @@
>
> #define DISP_PARA_DISP_ON BIT(31)
> #define DISP_PARA_SWAP_EN BIT(30)
> -#define DISP_PARA_LINE_PATTERN_UYVY_H (GENMASK(29, 28) | BIT(26))
> -#define DISP_PARA_LINE_PATTERN_RGB565 GENMASK(28, 26)
> -#define DISP_PARA_LINE_PATTERN_RGB888 0
> +#define DISP_PARA_LINE_PATTERN_UYVY_H (13 << 26)
> +#define DISP_PARA_LINE_PATTERN_RGB565 (7 << 26)
> +#define DISP_PARA_LINE_PATTERN_RGB888 (0 << 26)
Can we use hex here for the left size of the shift operation, so it's
subjectively easier to read ? DTTO for the other values ?
That is:
-#define DISP_PARA_LINE_PATTERN_UYVY_H (13 << 26)
+#define DISP_PARA_LINE_PATTERN_UYVY_H (0xd << 26)
[...]
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